"Kommersant": Russia and the United States are in contact through an unofficial line

It is noted that the Russian side warns Washington that support for Ukraine could lead countries to a "dangerous line."

The United States declares "catastrophic consequences" in the event of the use of nuclear weapons.

Russian Foreign Minister Sergei Lavrov earlier noted that the inadmissibility of nuclear war is Russia's principled position.

The Foreign Ministry also reported that the use of nuclear reaction forces by Moscow, according to Russian military doctrine, is possible only in response to aggression.